Instruction Manual

138 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014
Chapter 11 Connecting a ControlLogix Controller to Remote I/O
Scan Remote FLEX Adapters
through Multiple
1756-DHRIO or
1756-DHRIOXT Modules in a
Local Chassis
In this application, a ControlLogix controller scans multiple FLEX remote I/O
adapters through multiple 1756-DHRIO or 1756-DHRIOXT modules in the
local chassis.
The following figure illustrates the steps you must use in this example.
Configure the Module Switches
In this application, channel B on the 1756-DHRIO and 1756-DHRIOXT
module must be set for RIO. Channel A can be used for remote I/O or DH+,
regardless of the usage assigned to channel B.
1756-DHRIOControlLogix Controller
1794-FLEX I/O
Rack Number: 025
Starting Group 0
1/2 Rack
1794-FLEX I/O
Rack Number: 035
Starting Group 4
1/4 Rack
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